🔧 Elevate Your Craftsmanship with Precision! With a 1-1/4" base diameter, it fits seamlessly into your toolkit. The fine-adjusting screw allows for meticulous adjustments, perfect for professionals. Built to withstand the rigors of daily use, ensuring longevity. Experience the accuracy of a 40-pitch screw for fine adjustments. Ideal for a variety of tasks, making it a must-have for any serious craftsman. 1-1/4" base diameter Fine-adjusting screw 40-pitch screw The Starrett F190A Jack features a 40-pitch screw and a compact 1-1/4" base diameter, designed for fine adjustments and built for durability, making it an essential tool for professionals seeking precision in their work.